Pinpoint Test D: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) P0635 Power Steering Control Circuit

Normal Operation and Fault Conditions

Description

Description
The PSCM continually monitors the motor current sensor when the ignition is ON and the voltage supply to the PSCM is above 5.13 volts. If an error is detected, a DTC is set.
REFER to: Power Steering - System Operation and Component Description .

Diagnostic Aids

Diagnostic Aids
When this DTC sets, the PSCM uses a backup current sensor and does not need to be replaced. Steering functionality is not affected and the driver should not observe any change in steering behavior.
Do not install a new EPAS gear as part of the repair for a PSCM DTC P0635:68.
Using a diagnostic scan tool, clear the PSCM DTC. return the vehicle to the customer.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PSCM P0635:68	Power Steering Control Circuit: Event Information	Sets due to a fault tolerant internal error in the PSCM current sensor.

Possible Sources

PSCM current sensor failure

D1 CHECK THE DIAGNOSTIC TROUBLE CODES (DTCS) FROM ALL MODULES

Ignition ON.

Using a diagnostic scan tool, retrieve the Continuous Memory Diagnostic Trouble Codes (CM DTCs) from all modules.

Are Diagnostic Trouble Codes (DTCs) present in the PSCM or any other modules?

Yes	DIAGNOSE the Diagnostic Trouble Codes (DTCs) in the PSCM and other vehicle modules.For the PSCM, REFER to Diagnostic Trouble Code (DTC) Chart .For other vehicle modules, REFER to the appropriate DTC Chart.

CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If there are no Diagnostic Trouble Codes (DTCs) present and there are no service articles associated with this concern and the concern cannot be verified, RETURN the vehicle to the customer.